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FAQs on PPT: Properties of Pure Substances - Thermodynamics - Mechanical Engineering

1. What are the properties of pure substances in mechanical engineering?
Ans. Pure substances in mechanical engineering have distinct and well-defined properties, including temperature, pressure, specific volume, internal energy, and entropy. These properties are independent of the substance's mass or the amount of substance present.
2. How is temperature defined for pure substances in mechanical engineering?
Ans. Temperature, a property of pure substances in mechanical engineering, is a measure of the average kinetic energy of the molecules in a substance. It is typically measured in degrees Celsius (°C) or Kelvin (K) and is used to determine the direction of heat transfer.
3. What is specific volume and how is it relevant to pure substances in mechanical engineering?
Ans. Specific volume, a property of pure substances in mechanical engineering, is defined as the volume occupied by a unit mass of substance. It is often used to analyze the behavior of gases and can provide insights into the density and compressibility of a substance.
4. How does pressure affect pure substances in mechanical engineering?
Ans. Pressure, a property of pure substances in mechanical engineering, refers to the force exerted by a substance per unit area. It plays a crucial role in determining the behavior and phase changes of substances, such as boiling or condensation, and can be measured in units like pascals (Pa) or pounds per square inch (psi).
5. What is entropy and why is it important in the study of pure substances in mechanical engineering?
Ans. Entropy, a property of pure substances in mechanical engineering, is a measure of the disorder or randomness within a system. It indicates the amount of energy that cannot be converted into useful work. Understanding entropy helps engineers analyze energy transfer, heat flow, and the efficiency of processes involving pure substances.
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